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presents:
Android Java J2EE Specialist
Author of
available on
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•Android in numbers
•Installing the work space
•Creating a project
•Using DDMS perspective
•Using DDMS perspective and Eclipse Debug Bridge
•Tracking memory leaks
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Android Trainer Consultant Expert
mathias.seguy.it@gmail.com (mail)
@android2ee (twitter)
Author of eBooks on Android programming (Android2ee.com)
Android Speaker and Teacher
Fundamentals Mathematics Doctor
Technical expert of the “Agence Nationale de la Recherche”
Developpez.com Redactor
Android Blogs : Android2EE sur DVP et Android2ee sur BlogSpot
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Mathematics Android2EE
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Java J2EE
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Developer Developer GUI Leader Technical Technical Manager Technical Director Android2EE
Leader Leader Leader Founder
ENSEEIHT‟s IT At STI
Master
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•2003 Android Inc creation
•2005 Google bought Android
•2007 Open Handset Alliance birth
•2007 Android Beta SDK released
In 3 years, from September 2008 to
November 2011, 8 major versions of the
system are delivered by Google
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Android in numbers:
• 27% of mobiles are smart phones (World Wild, 2011);
• 52.5% of smart phones are Android phones (World Wild, Dec 2011);
• 1 smart phone over two sold is an Android Phone (US, Dec 2011);
• +17391% of available applications on GooglePlay in 3 years;
• +500 000 applications in GooglePlay (April 2012);
• +15 000 000 downloads (May 2012);
• 2012 will be the Android Tablet year.
Ok, today, Android is the smart phones OS winner.
But tomorrow, Android will be everywhere: mobile, tablet, TV, watches, Hifi, car, appliances, home automation
Everywhere, I tell you.
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It‟s pretty easy:
First:
• Download Java
(http://www.oracle.com/technetwork/java/javase/do
wnloads/index.html) and install it;
• Download Eclipse
(http://www.eclipse.org/downloads/) and install it;
• Download the Android SDK
(http://developer.android.com/sdk/index.html) and
unzip it.
In Eclipse, add the Android plugin:
• Go in Help/install New software. Click Add and
set Android and https://dl-
ssl.google.com/android/eclipse/
• Select all the elements, click next and finish.
Restart Eclipse :
• In WindowPreference select Android et set the
Android SDK path (the folder in which you unzip
the Android SDK)
Ok, it‟s done, you can code Android program.

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Now open the SDK Manager
And launch the update/installation (Android SDK Tools,
platform-tools, SDK, documentation,…).
A long download is waiting for you.
Then define Android Virtual Device (Emulator) for tests.

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Now open the SDK Manager
A quick glance at the window.

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Open the AVD window.

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Open the AVD window.
Select new.
Define a new Emulator:
• Name
• Target
• SD card size
• Skin (resolution)
• Hardware

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Let‟s create a first project a see :
• Android “new project” Wizard
• Android Manifest wysiwyg
• Android Layout wysiwyg
• Android resources wysiwyg
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Let‟s create a first project a see :
File->new->Others…-> Android Project and follow the wizard:
Project Name, Project SDK to target,
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Let‟s create a first project a see :
File->new->Others…-> Android Project and follow the wizard:
Project Name, Project SDK to target, Application name, Package name, Activity name, min SDK,
Project created
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Open the DDMS perspective.
• Devices
• Emulator Control
• Set of action buttons
• File Explorer
• Resource explorer
• Lint Warning
• LogCat
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Status Version/Tid/Pid
Devices Connected
Avaiable Processes
to watch
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Control the emulator telephony status
Emulate a phone call to the emulator
Emulate the reception of an SMS
Control the emulator geo-location using:
Your own lat/long
A GPX file
A KML file
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Screen
Debug Heap Thread Stop Capture
Take a
screen
shoot
Strart the « Debug » Stop a process
on a Process
Begin CPU time
Begin the Heap Cause Garbage tracking
tracking using the Collector usefull to
Heap View update heap stats Begin threads
tracking using the
Dump the Heap Threads View
within Eclipse (using
MAT) or in a file
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Create a folder
Delete a file
Push a file onto the
device
Pull a file from the
device
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Ressources used by
the process
Selected process
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List all the problems found in the workspace, a PMD like dedicated to Android
Description Category Location Description of the rule
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Using the Debug mode with
the DDMS perspective.
• Allocation tracker
• Heap tracking
• Threads tracking
• Heap Dump
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It‟s quiet simple: Thread I.H.M Thread de traitement
Link an activity with a life cycle and a Activity Handler
thread with no management sendMessage(
between the thread lifecycle and the )
message
OnDestroy()
OnCreate()
Thread de traitement initiale
Thread I.H.M sendMessage
()
Activity Handler
fantôme fantôme
Thread de traitement
Activity Handler
sendMessage(
)
message
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Application
Main
Activity Handler Thread 1
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Application
Main
Activity 1 Handler 1 Thread 1
Main
Activity 2 Handler 2 Thread 2
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Application
Main
Activity 1 Handler 1 Thread 1
Main
Activity 2 Handler 2 Thread 2
Main
Activity 3 Handler 3 Thread 3
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Shallow heap is the memory consumed by one object. GC Root
S=100
Retained set of X is the set of objects which would be R=400
removed by GC when X is garbage collected.
Retained heap of X is the sum of shallow sizes of all objects
in the retained set of X, i.e. memory kept alive by X.
Generally speaking, shallow heap of an object is its size in the
heap and retained size of the same object is the amount of S=100 S=100
heap memory that will be freed when the object is garbage R=200 R=100
collected.
S=100
R=100
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Using the Debug mode with
the DDMS perspective.
• Allocation tracker
• Heap tracking
• Threads tracking
• Heap Dump
• Save the heap,
• Convert the heap using: hpro-conv dump.hprof dump-converted.hprof
• D:Eclipseeclipsex64_indigo_Androidandroid-sdktools>hprof-conv.exe
D:AndroidConferenceEclipseDayToulousehrpofcom.android2ee.tuto.thread.orphan.hprof
D:AndroidConferenceEclipseDayToulousehrpofcom.android2ee.tuto.thread.orphan.converted.prof
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• Open it in MAT the converted hprof
• Dominator tree => We detect our Thread
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• Open it in MAT the converted hprof
• Dominator tree => We detect our Thread
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• Now, open the Histogram View
• Choose byte[] and select “list object with incoming reference”
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• Now, open the Histogram View
• Choose byte[] and select “list object with incoming reference”
• Open the items and fall on your class and select “list object with incoming reference”
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• Now, open the Histogram View
• Choose byte[] and select “list object with incoming reference”
• Open the items and fall on your class and select “list object with incoming reference”
• Find again the duplicated activity
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• Now, open the Histogram View
• Choose byte[] and select “list object with incoming reference”
• Open the items and fall on your class and select “list object with incoming reference”
• Find again the duplicated activity
 Open one of then and Just look at the Handler and the Background Thread => Leak Resolved
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This presentation has used the following references:
• Android2ee„s Ebooks and tutorials : http://www.android2ee.com
• Android web sites:
• http://developer.android.com/index.html
• http://android-developers.blogspot.fr/
• http://www.google.com/events/io/2011/sessions.html
• Android Design Guide: http://developer.android.com/design/index.html
On Android2ee, you‟ll find the following tutorials:
• Sensors
• Threads, handlers and memory leaks
• AppWidgets
• Dynamic GUI creation
• REST Services
• RSS reader
• Use Maven for Android projects
• Deliver on GooglePlay
Sur developpez.com vous trouverez les articles suivants (français seulement):
•Déployer son application Android et obtenir sa clef MapView.
•Construire dynamiquement ses IHM Android
•Les capteurs Android
•Thread, Handler, AsyncTask et fuites mémoires
•Investir l'écran d'accueil Android avec les AppWidgets
•Android, Livrer son projet sur GooglePlay
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Thanks for your attention.
android2ee.com. See you in:
Brazzaville
#android2ee In September
mathias.seguy.it@gmail.com
MySensors, MyLight et MyTorch
available on GooglePlay
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